a) Can you develop Java code.Create a recursive function to print all permutations of a string. For example, the permutation of the string "abc" is [abc, acb, bac, bca, cab, cba]. b) Revise the genericStack class to use an array instead of an ArrayList. Before adding a new element, make sure the array size is correct. If the current array is full, construct a new array twice the size, copy the elements, and add the new array. dont use ai

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